update to new ts version

Author: xaverh

package-lock.json

@@ -225,7 +225,7 @@
   "devDependencies": {
     "@types/node": "^7.10.2",
     "@types/sax": "^1.0.1",
-    "typescript": "^2.9.2",
+    "typescript": "^3.1.6",
     "vscode": "^1.1.22"
   },
   "icon": "clang-format.png",